Mechanism for severing moving webs into lengths



Nav. 29, 1927.

W. E. MQLINS MECHANISM FOR SEVERING MOVING WEBS INTO LENGTHS FiledJan.22, 1927 Patented Nov. 29, 1927.

UNITED STATES PATENT OFFICE.-

MECHANISM FOR SEVERING MOVING WEBSv INTO LENGTHS.

Application filed January 22, 1927, Serial No. 162,910, and in GreatBritain January 22, 1926.

This invention is for improvements in or relating to a device forsevermg a moving web 1nto lengths and more partlcularly to a devicewherein the cutting mechanism com-' prises a fixed blade adapted toco-operate .with a rotary blade, and it is the object of the presentinvention to provide on such a device means whereby the leading edge ofthe sever-ed web is simultaneously deflected from both the fixed androtary blades in its path through the machine.

The present invention consists of a device for severing a travelling webof paper or the like, into lengths which comprises in combination afixed cutting blade a rotary cutting blade, means adapted to deflect theleading edge of the freshly cut web out of the path of the fixed bladeand an air current adapted to deflect the leading edge of the web out ofthe path of the rotary blade.

The invention is more particularly described with reference to theaccompanying drawing which illustrates one method of carrying theinvention into effect wherein gig. 1 is a section of the cutting device,an

' Fig. 2 shows the parts in a different position.

Referring to the drawing which illustrates a cuttin to Britis patentspecification No. 245,261, wherein a resilient deflector 1 isarranged tooperate in conjunction with the fixed blade 2 in the manner described inBritish patent specification No. 245.261 to remove the lead ing edge ofthe freshly cut web out of the path of the fixed blade 2. It is found inpractice that when the leading edge of the web has been deflected fromthe fixed blade there is a tendency for the same to be attracted by therotary blade 3 and adhere to the same, thereby rendering the delivery ofthe various strips to a stacking mechanism extremely difficult.

In the deflebtor described in my British patent specification No.245,261, the deflector is mounted so as to be directed towards thecutting edge of the fixed blade 2 in such a manner that the free end ofthe deflector 1 is located in the .path of the rotary blade.

According to one construction of the presmechanism constructed accordingent invention the deflector associated with the rotary cutting bladecomprises a pneumatic device 4 adapted to produce an upwardly directedair blast indicated by the numeral 5 and adapted to issue from thenozzle 6 of the device 4 in a line joining the nozzle 6 with the freeend of the deflector 1.

It is found in practice that as the web is being fed through the machinethe air blast 5 associated with the rotary blade 3 is deflected by thesurface 7 of the rotary cutting blade on to the travelling web 8 and theinclmation of the air blast varies as the rotary cutting blade movestowards the fixed blade. After the Web has been severed the air blastsupports the leading edge of the web and peels 1t from the edge of therotary blade.

The force of the air blast is suflicient to destroy any tendency for theWeb to adhere to the rotary blade, and also acts as a support which, inthe case of a freshly printed surface, prevents any tendency to smear.

In addition to the oblique blast there may i be provided air nozzles 9and 10 on either side of the cutting mechanism which permitan upwardlydirected blast of air to support the web in its forward movement, andthere- 'after support the strips in their path towards the stackingmechanism so as to ensure that the printed strip does not come incontact with any surface which might smudge the same.

What I claim as m invention and desire to secure by Letters atent is 1.A device for severing a travelling web of paper or the like intolengths, which comprises in combination a fixed cutting blade,

a rotary cutting blade, means adapted to deflect the leading edge of thefreshly cut web out of a path which includes the fixed blade and an aircurrent adapted to deflect the leading edge of the web out of the pathof the rotary blade.

2. A device for severing a travelling web of paper or the like intolengths which comprises in combination a fixed cutting blade, a rotarycutting blade, a resilient deflector 1nclined to the plane of the fixedblade in such a manner that the leading edge thereof is located in closeproximity to the edge of the fixed blade and in the path of the rotaryblade in such a manner as to deflect the leading edge of the freshly cutWeb out of a path which includes the fixed blade and an air currentadapted to issue in the direction of movement of the rotary blade, butdirected away from the axis of the rotary blade and towards the free endof the deflector of away from the edge of the rotary blade.

In testimony whereof I hereunto affix my slgnature.

WALTER EVERETT MOLINS.

